#include <bits/stdc++.h>
using namespace std;

int main(int argc, char const *argv[])
{
    // 字符串是可以分开多行
    string s1 = "123"
                "abc";

    string s2 = "12"   
                "3"
                "ab"
                "c";

    string s3 = "12"
         "3ab"
         "c";

    cout << s1 << endl;
    cout << s2 << endl;
    cout << s3 << endl;

    return 0;
}
